Original article
Electrochemical and in silico approaches for liver metabolic oxidation of antitumor-active triazoloacridinone C-1305

https://doi.org/10.1016/j.jpha.2020.03.011Get rights and content
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Highlights

  • Three different strategies for the investigation of C-1305 oxidative metabolism were presented.

  • Phase I products of the antitumor agent were easily generated within a matrix-free environment.

  • Products of C-1305 electrochemical oxidation were typical for P450-catalyzed reactions.

  • We observed a good accordance between electrochemical, in silico, and enzymatic results.

  • Electrochemical and in silico methods are fast alternatives for enzymatic assays.

Abstract

5-Dimethylaminopropylamino-8-hydroxytriazoloacridinone (C-1305) is a promising antitumor compound developed in our laboratory. A better understanding of its metabolic transformations is still needed to explain the multidirectional mechanism of pharmacological action of triazoloacridinone derivatives at all. Thus, the aim of the current work was to predict oxidative pathways of C-1305 that would reflect its phase I metabolism. The multi-tool analysis of C-1305 metabolism included electrochemical conversion and in silico sites of metabolism predictions in relation to liver microsomal model. In the framework of the first approach, an electrochemical cell was coupled on-line to an electrospray ionization mass spectrometer. The effluent of the electrochemical cell was also injected onto a liquid chromatography column for the separation of different products formed prior to mass spectrometry analysis. In silico studies were performed using MetaSite software. Standard microsomal incubation was employed as a reference procedure. We found that C-1305 underwent electrochemical oxidation primarily on the dialkylaminoalkylamino moiety. An unknown N-dealkylated and hydroxylated C-1305 products have been identified. The electrochemical system was also able to simulate oxygenation reactions. Similar pattern of C-1305 metabolism has been predicted using in silico approach. Both proposed strategies showed high agreement in relation to the generated metabolic products of C-1305. Thus, we conclude that they can be considered as simple alternatives to enzymatic assays, affording time and cost efficiency.

Keywords

Antitumor triazoloacridinone
P450-catalyzed reactions
Electrochemistry/mass spectrometry
In silico metabolism Prediction
Liver microsomal assay

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Peer review under responsibility of Xi'an Jiaotong University.

Parts of this work were presented at the 13th European ISSX Meeting (Glasgow, Scotland, 2015) and at the 20th North American ISSX Meeting (Orlando, FL, USA, 2015).